Maintain Schedule Of Classes Error: Data being added conflicts with existing data. (18,2)

The solution mentioned below doe not work for us.

Maintain Schedule Of Classes Error: 'Data Being Added Conflicts With Existing Data' (Doc ID 2818372.1)

After we increase the value of the Event Number to one higher then the highest event used in the class table, campus event, and campus meeting tables. The component still shows the same error:

Data being added conflicts with existing data. (18,2)

When adding a new item to the database, the system found a conflicting item already exists.

This problem can happen if another user has entered similar information at the same time as you.

Note the changes you have made, cancel the page, then retry your changes.